Type

Features

Type

Composition

B

Pt-30Rh/Pt-6Rh

Thermocouple which combines a positive wire of a platinum-rhodium alloy containing 70% platinum and 30% rhodium with a negative wire of platinum rhodium containing 94% platinum and 6% rhodium. Type B is more resistant to heat and mechanical stress than type R and withstands 1800℃ Max. Other features are the same as those of type R.

R

Pt-13Rh/Pt

Thermocouple which combines a positive wire of a platinum and rhodium alloy containing 87% platinum and 13% rhodium with a negative wire of pure platinum. This thermocouple is highly accurate, excellent in heat resistance and stability, generally used in oxidizing atmospheres. It is not recommended for use in reducing atmospheres or where metal vapors are present.

S

Pt-10Rh/Pt

Thermocouple which combines a positive wire of a platinum rhodium alloy containing 90% platinum and 10% rhodium with a negative wire of pure platinum. Other features are the same as those of type R.

N

Ni-Cr-Si / Ni-Si

This is called Nicrosil (positive leg) / Nisil (negative leg) thermocouple, and its composition and characteristics are very similar to those of type K thermocouple. It is an improved type of Type K thermocouple and has more Si additive, higher heat resistance.

K

Ni-Cr / Ni-Al

Thermocouple which combines a positive wire of an alloy consisting mainly of nickel and chromium with negative wire of an alloy consisting mainly of nickel. This thermocouple widely used for many industrial applications is resistant to oxidizing atmospheres but not to reducing atmospheres. It particularly should not be used in carbon monoxide, sulfurous acid gas or sulfur bearing hydrogen atmospheres．

E

Ni-Cr / Cu-Ni

Thermocouple which combines a positive wire of thermocouple K with a negative wire of thermocouple J. This thermocouple has a high thermal EMF and is suitable for use in oxidizing atmosphere．

J

Fe / Cu-Ni

Thermocouple which combines a positive wire of iron is resistant in reducing atmosphere and is also resistant to hydrogen and carbon. However it should not be used in atmospheres that will oxidize iron. It is relatively low in cost and often used for medium temperature range applications.

T

Cu / Cu-Ni

Thermocouple which combines a positive wire of copper with a negative wire of an alloy mainly of copper and nickel. High accuracy is obtained at under 300℃ and it is suitable for low temperature from -200℃～+100℃. It is suitable for use in weak oxidizing and reducing atmosphere.